Power-saving/performance toggles for amdgpu

[Bastien Nocera]

On Mon, 2020-09-14 at 01:46 -0400, Alex Deucher wrote:
> 
<snip>
> On older radeons (e.g., pre-GCN hardware), there were separate power
> states for battery and AC, but these asics are supported by the
> radeon
> kernel driver.  None of the hardware supported by amdgpu exposes
> anything like that anymore.  The rest is mainly for profiling and
> debugging.  For more information see the relevant kernel
> documentation:
> https://www.kernel.org/doc/html/latest/gpu/amdgpu.html#gpu-power-thermal-controls-and-monitoring
> I don't think there is anything you'd want to tweak there.

That was very helpful, thanks very much!